/**
 * SEO component that queries for data with
 *  Gatsby's useStaticQuery React hook
 *
 * See: https://www.gatsbyjs.org/docs/use-static-query/
 */

import React from 'react';
import PropTypes from 'prop-types';
import Helmet from 'react-helmet';
import { useStaticQuery, graphql } from 'gatsby';

function SEO({ description, lang, meta, title }) {
  const { site } = useStaticQuery(
    graphql`
      query {
        site {
          siteMetadata {
            title
            description
          }
        }
      }
    `
  );

  return (
    <Helmet
      htmlAttributes={{
        lang,
      }}
      title={title}
      titleTemplate={`%s | ${site.siteMetadata.title}`}
    />
  );
}

SEO.defaultProps = {
  lang: `en`,
  meta: [],
  description: ``,
};

SEO.propTypes = {
  description: PropTypes.string,
  lang: PropTypes.string,
  meta: PropTypes.arrayOf(PropTypes.object),
  title: PropTypes.string.isRequired,
};

export default SEO;
